Update & Fix grammar throughout docs files
Applies many small changes throughout the documentation files, aimed at
readability.
Add support for <form title>/<form alt>
Clarify installation instructions based on testing/feedback.
Improve fallbacks for missing markers.
Don't let marks interfer with silence collapsing.
Make '#' refer to top of page.
Draft SpeechD integration.
Implement table navigation.
Spanish useragent stylesheet localizations.
Add arrow key navigation inside pages.
Extract navigation state out of SSML <marker>s.
BUG: incorrect counter resets.
Stylesheet updates for details, taking advantage of pseudoclasses, and attempted counters fix.
Fix markers misserialization.
Ensure marker counters are incremented.
Propagate local attrs through to output.